[Swiftwater Gazette] enabling full duplex

Ed kroposki kroposki at att.net
Fri Oct 6 06:54:23 EDT 2017




  
Engineersinvent breakthrough millimeter-wave circulator IC
https://techxplore.com/news/2017-10-breakthrough-millimeter-wave-circulator-ic.html
ColumbiaEngineering researchers continue to break new ground in developingmagnet-free non-reciprocal components in modern semiconductorprocesses. 
Atthe IEEE International Solid-State Circuits Conference in February,Krishnaswamy's group unveiled a new device: the first magnet-freenon-reciprocal circulator on a silicon chip that operates atmillimeter-wave frequencies (frequencies near and above 30GHz). 
Followingup in Nature Communications, the team demonstrated the physicalprinciples behind the new device.
https://www.nature.com/articles/s41467-017-00798-9
Thekey advance of this new approach is that it enables circulators to bebuilt in conventional semiconductor chips and operate atmillimeter-wave frequencies, enabling full-duplex or two-waywireless. 
Virtuallyall electronic devices currently operate in half-duplex mode at lowerradio-frequencies (below 6GHz), and consequently, we are rapidlyrunning out of bandwidth. Full-duplex communications, in which atransmitter and a receiver of a transceiver operate simultaneously onthe same frequency channel, enables doubling of data capacity within existing bandwidth. Going to the higher mm-wave frequencies, 30GHz and above, opens up new bandwidth that is notcurrently in use.
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